AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
AP1121 Rev. 5 1 of 7 FEBRUARY 2009
www.diodes.com © Diodes In corporat ed
Lead-free
• 1.3V maximum dropout at full load current
• Fast transient response
• Output current limiting for each channel
• Built-in thermal shutdown for each channel
• Good noise rejection
• Dual output ch1 = 3.3V, ch2 = 2.5V
(ch2 = 1.8V for version B)
• SOP-8L: Available in “Green” Molding Compound
(No Br, Sb)
Lead Free Finish/ RoHS Compliant (Note 1)
AP1121 is a low dropout positive regulator which provides 1A
output current capability. The product is specifically designed to
provide well-regulated supply for low voltage IC applications such
as high-speed bus termination and low current 3.3V/2.5V or
3.3V/1.8V logic supply. AP1121 is guaranteed to have <1.3V
dropout at full load current making it ideal to provide well
regulated outputs dual channels with up to 18V input supply.
• PC peripheral
• Communication
Package
S : SOP- 8L Packing
Lead Free
L : Lead Free 13 : Tape & Reel
Vout
A : CH1=3.3V
CH2=2.5V
B : CH1=3.3V
CH2=1.8V
G : Green
AP 1121 X S X - 13
Device Package
Code Packaging
(Not e 2) 13” Tape and Reel
Quantity Part Number Suffix
AP1121XSL-13 S SOP-8L 2500/Tape & Reel -13
AP1121XSG-13 S SOP-8L 2500/Tape & Reel -13
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Ple ase visit our website at
http://www.diodes.com/products/lead_free.html.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be on found our website at
http://www.diodes.com/datasheets/ap02001.pdf.
Features General Description
Applications
Ordering Information
AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
AP1121 Rev. 5 2 of 7 FEBRUARY 2009
www.diodes.com © Diodes In corporat ed
VOUT1
VOUT2
VIN1
VIN2
1
2
3
4
8
7
6
5GND
GND
GND
GND
SOP-8L
AP1121
( Top View )
Pin Name Descriptions
GND Ground
3.3V(VOUT1) The output of the regulator. A minimum of 10uF capacitor (0.15Ω ≤ ESR ≤ 20Ω) must be
connected from this pin to ground to insure stability.
2.5V/1.8V
(VOUT2)
VIN The input pin of regulator. Typically a large storage capacitor (0.15Ω ≤ ESR ≤ 20Ω) is
connected from this pin to ground.
Pin Assignments
Pin Descriptions
AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
AP1121 Rev. 5 3 of 7 FEBRUARY 2009
www.diodes.com © Diodes In corporat ed
Block Diagram
2
Thermal
Shutdown
1
VOUT1
1.25V +
CURRENT
LIMIT
VIN1
+
5/6
GND
3
Thermal
Shutdown
4VOUT2
1.25V +
CURRENT
LIMIT
VIN2
+
7/8
GND
+
-
+
-
++
-
-
Typical Application Circuit
5V
3.3V/1A
C2
100uF
VIN1
VOUT1
GNDVIN2
C1
100uF
C3
100uF
2.5V/1A VOUT2
GND
GND
GND
(3.3V/2.5V Dual output )
AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
AP1121 Rev. 5 4 of 7 FEBRUARY 2009
www.diodes.com © Diodes In corporat ed
Absolute Maximum Ratings
Symbol Parameter Rating Unit
VIN DC Supply Voltage -0.3 to 18 V V
TST Storage Temperature -65 to +150 oC
TOP Operating Junction Temperature Range 0 to +12 5 oC
TM Maximum Junction Temperature 150 oC
Electrical Characteristics (Under Operating Conditions)
Paramete
r
Conditions Min Typ. Max Unit
Output Voltage
AP1121_ - VOUT1 IOUT = 10mA, TA = 25oC,
4.8V≤VIN≤12V 3.235 3.300 3.365 V
AP1121A - VOUT2 IOUT = 10mA, TA = 25oC,
4V
≤
VIN
≤
12V 2.450 2.500 2.550 V
AP1121B - VOUT2 IOUT = 10mA, TA = 25oC,
4V≤VIN≤12V 1.764 1.800 1.836 V
Line Regulation IO = 10mA, VOUT +1.5V<VIN<12V, TA= 25oC 0.2 %
Load Regulation
AP1121 series
VOUT1 VIN = 5V, 0≤IOUT ≤1A,
TA= 25oC (Note 3, 4) 26 33 mV
AP1121 series
VOUT2 VIN = 4V, 0mA<Io<1A,
TA= 25oC (Note 4, 5) 20 25 mV
Dropout Voltage
(VIN-VOUT) IOUT = 1A, ΔVOUT = 0.1%VOUT 1.3 1.4 V
Current Limit (VIN-VOUT) = 5V 1. 1 A
Minimum Load Current 0oC≤Tj≤125oC (Note 5) 5 10 mA
Thermal Regulation TA = 25 oC, 30ms pulse 0.008 0.04 %/W
Ripple Rejection F = 120Hz, COUT = 25uF Tantalum, IOUT = 1A 60 70 dB
Temperature Stability IO = 10mA 0.5 %
JA
θ
Thermal Resistance
Junc t i o n- t o - A m bi ent (No
heat sink; No air flow)
SOP-8L: Control Circuitry/Power Transistor
(Note 6)
CH1 or CH2 only
CH1 & CH2 and PD1 = PD2
177
158
OC/W
JC
θ
Thermal Resistance
Junction-to-Case
SOP-8L: Control Circuitry/Power Transistor
(Note 6)
CH1 or CH2 only
CH1 & CH2 and PD1 = PD2
29
19
OC/W
Notes: 3. See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant
junct ion temperature by low duty cycle pulse testing. Load regulat ion is measured at the output lead = 1/18” from the package.
4. Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Po wer dissipation is det erm ined by the in put/ output
differentially and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range.
5. Quiescent current is defined as the minimum output current that requ ir es maintaining regulation. At 12V input/output differential the device is
guar anteed to regulate if the output current is greater than 10mA.
6. Vout1 and Vout2 are connected to the PCB copper area 5.5mm*5.5mm separately. If you need large PD or lower Tc & Tj, please connect to
t he large copper area >> 5.5mm*5.5mm (like 10mm*10mm).
AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
AP1121 Rev. 5 5 of 7 FEBRUARY 2009
www.diodes.com © Diodes In corporat ed
Typical Performance Characteristics
Temperature (
o
C)
Percent Change in Output Voltage vs Temperature
Output Voltage Change (%)
-50 -25 0 25 50 75 100 125 150
- 2
-1.5
- 1
-0.5
0
0. 5
1
1.5
2
Input Voltage (V)
Line Regulation
Output Voltage Deviation (%)
0
0.2
0.4
0.6
0.8
1
24
681012
TIME (us )
Line Transient Response
Output Voltage Deviat i on (mV) Input Voltage (V)
-40
-20
0
20
40
5.5
6.5
7.5 Cin=1uF
Cout=10uF Tantalum
0 20 40 60 80 100 120 140 160 180 200
TIME (us)
Load Transient Response
Load Current (A) Output Voltage Deviation (mV)
010
20 30 40 50 60 70 80 90 100
-1
0
1
2
-20
-10
0
10
20
30 C in = 1uF
C out = 10 uF Tantalum
Preload = 100mA
Dropout Voltage vs Output Current
Temperature (
o
C)
Load Regulation vs Temperature
Output Voltage Deviation (%)
-25 0 25 50 75 100 125
- 1
-0.80
-0.40
-0.20
0
0.20
I load=800 mA
Output Current (mA)
Dropout Voltage (V)
0
0. 2
0. 4
0. 6
0. 8
1. 0
1. 2
1. 4
1. 6
1. 8
2. 0
0250 500 750 1000
Tj = 125
o
C
Tj = 25
o
C
AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
AP1121 Rev. 5 6 of 7 FEBRUARY 2009
www.diodes.com © Diodes In corporat ed
Marking Information
(1) SOP-8L
( Top View )
AP1121 X
YY WW
XX
Logo
Part Number
5
8
41
WW : Week : 01~52; 52
YY : Year : 08, 09,10~
L : Lead Free
X : Internal Code
represents 52 and 53 week
A : 3.3V/2.5V version
B : 3.3V/1.8V version
G : Green
Package Information
(1) Package type: SOP-8L
1.27typ 0.3/0.5
7°~9°
4.85/4.95
3.85/3.95
5.90/6.10
0.15/0.25
7°~9°
0.62/0.82
0.10/0.20
Gauge Plane
0.254
Seating Plane
0.35max. 45°
Detail "A"
Detail "A"
1.30/1.50
1.75max.
Land Pattern Recommendation
(Unit: mm)
6x-1.27
8x-1.55
8x-0.60
5.4
0°/8°
AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
AP1121 Rev. 5 7 of 7 FEBRUARY 2009
www.diodes.com © Diodes In corporat ed
IMPORTANT NOTICE
LIFE SU PPOR T
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will
agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages.
Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the
President of Diodes Incorporated.
